Improved lock



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l ZEBADIAH SARGENT, OF ROCH-ESTER, NEW HAMPSHIRE.

Letters Patent Il T 100,195, cla-ted February l22, 1870.

IMPRovED LOCK.

The Schedule referred 'to in these Letters Patentan making part f the samey vTol all persons to whom these presents may come:

flocks, wi th the handle-shank arm for moving the bolt.

-liigure 4 is a top view of' the whole, showing the position of the key-esentcheon and the lock relatively to a, door.

Figure 5 is a side view of the key.

The bolt-case A is formed so as to be capable of beingr inserted in a mortise or cylindrical hole bored into the door B from its edge.

Within the. rear part ofthe said case is a spring, G, for advancing the latch-bolt D.Y

A hole, a, for reception ofthe'fulcrum b of the key, is bored transversely into or through the bolt.

Near to this hole the bolt is provided with a dovetailed recess, c, extended transversely across it to re-v ceive a slide, d, of' corresponding form. This recess, when the holt is advanced, opens into a shorter dovetailed recess, e, made in the lock-case. A

Through the said slide isa small hole, b', to receive a stud or projection, f, extended from the bit g ofthe key, in manner as shown in fig. 5.

Another such slide, d', is also represented as applied to the opposite face of the bolt, and to operate with another recess, e', made in the case, the whole being as shown in iigs. 2 and 6, the latter being another side v elevation ol' the lock.

A spring, i, arranged within the bolt carries a stud, k, which projects into 'the locking-slide, there being such a spring and stud to eachy of the lockingslides.

The stud ofthe key has a length equal to the thickness oi' the locking-slide.

Furthermore, there is a mortise, m, on the bolt to receive an arm, n, which projects from the shank of the knobs, the said shank being extended through a square hole, o, made in such arm. Y

The two escntcheon-plates t'or the key-hole P of' the door are shown at g g', there being one to each side ofthe door.

Each constitutes a cap to au opening, r, bored into l thedoor, and oi' asuitable form to enable the bit oi' the key, when in the door, to be turned .therein as may be necessary to elect'the vertical movements ot' the locking-slide.

By introducing the key into either escutcheon-plate and pressing the key inward, and turning it around until its stud nay enter the hole of' the lockingfslide, and afterward continuing to press the key-stud into such hole until the lockingstud k of' the spring i may be forced back or ont ofthe hole, the said slide will bein condition to be moved lengthwise bythe key',

and either into or out of the recess e. When the slide is in the said`recess e, the bolt will be locked so that it cannot be forced backward by turning,r either knob.

I would remark, that when the stud ofthe spring is in the lockingslide it would be very difficult t'or a person to move the slide. by other means than rthe key, and therefore the spring and bolt Aconstitute an additional security to the lock against it being opened, by

a pick-lock. l

I claim- Them-rangement as well as the combination of the' spring i and its stud 7c with the bolt and the slide, arranged together, and in Athejlmlt-case, and with respect to the recess e thereof', as set forth.

ZEBADIAH SARGENT. Witnesses:

R. H. EDDY, J. R. SNOW. 

